Lasting-pinchers



(ModeL) K. J. GREENWALD' LASTING PINGHBRS.

Patented Apr. 21, 1885..

my? M. 2m. gmwwd TATES A'rENr Fries.

LASTING PlNCHERS.

SPECIFICATION forming part of Letters Patent N0.316,35'7, dated April 21,1885.

Application filed April 30, 1883. (Model) "To aZZ whom it may concern:

Be it known that I, KASPER J. GREENVVALD, a citizen of the United States, residing in the city of Newark, in the county of Essex and State ofNew Jersey, have invented certain new and useful Improvementsin Lastiug-Pinchers, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention consists in sundry improve ments in the jaws of a lasting-pinchers, and in the combination therewith ofa hammer and a movable fulcrum pivoted thereto and adapted to bear upon the sole at any desired point.

The improvements will be best understood by reference to the annexed drawings, in which Figure l is anedge view of the under side of the pinchers. Fig. 2 is a side view of the same;

and Fig. 3 is an enlarged view of the jaws, showing the peculiar teeth.

(2 and e are the upper and lower jaws; j and i, the handles therefor; g, the pivot, and h a hammer attached to the jaw e beneath the rivet g.

a a is a line drawn through the pivot 9, tangent to the curve 0 0, common to the two jaws, and upon which curve, and tangent to a a, the clamping-teeth d and e are formed. (See Fig. 3.)

b b is a line drawn through the center I), from which the curve 0 c is drawn, and c c is a curve drawn from the center 9 tangential to the line b b. 1

In all the pinchers heretofore made with curved jaws the movement of the teeth to and from one anotlieris in a line oblique to the common curve 0 c, and as the teeth have commonly been made with sharp or angular ridges and the end ofjaw square, the movement described usually chafed or bruised the leather, so as to induce a rupture when the shoe was subjected to a little wear.

The object of this invention is to secure such a shape for the teeth d c and such a shape for the ends of the jaws as to avoid all chafing of the upper in lasting the shoe,- and this is done by making the lower teeth, 6, convex in form, and the opposite teeth, at, of suitable shape to press the leather upon the top of the arched teeth e without the use of any sharp corners; The upper teeth are therefore fitted to the crowns of the lower ones, but not to the angular grooves between them, the ridges upon the upperjaw being rounded off, as shown in Fig. 3. Such shape secures suiiicient friction to hold the leather securely under the severe strain of lasting, but would not alone prevent the bruising and cutting often caused by the ends of thejaws as commonly made. In pulling the leather over the edge of the last it is generally strained acutely over the end of the lower-jaw, and the corners of the jaw generally mark the leather injuriously, while the end or tip of the lowerjaw generally presents too sharp an angle to the line of draft of the leather and tends to cut or chafe it. I obviate both these defects at the tip of the jaws by making the entire ends of both jaws project more in the middle than at the corners; as at Z Z in Fig. 1, and improve the action of the inner edge of the lower-jaw by beveling or rounding it downward in the direction that the leather pulls. In Fig. 2 the direction of the leather is-indicated by the dotted line It, and the beveled end of the lower jaw obviously draws the leather more easily in such direction than if for med at an acute angle.

As a very narrow edge of the upper leather is sometimes presented to the jaws, I secure a grip upon such narrow part by providing an overhanging lip, Z, upon the upper jaw to match andv cover the bevel Z upon the other, and extend the upper jaw'somewhat beyond the other to sustain such lip.

The above-described features render the action of the teeth upon the leather much less injurious than that of other curved jaws; but to secure a still more perfect action of the teeth I arrange the curve of the same, 0 c, in such a relation to the pivot 9 that the teeth approach one another perpendicularly, and do not, therefore; rub or chafe the leather by the sliding movement common to the teeth in other curved jaws, in which the teeth approach one another quite obliquely, so as to slide a little past one another before they come to a bearing. By such sliding action the rear sides of the upper and lower teeth approach one another very closely before the front sides close upon the leather and almost shear the leather through by close pressure, which is avoided in my construction.

To secure such a perpendicular movement of the teeth toward one another at the point near the ends of the jaws where the leather is held, a radial line from that pivot should be tangent to the curve near the ends Z1; but in other curved jaws such line usually forms a tangent with the curve a 0 close to the pivot, asshown in Fig. 4. In Fig. 2the line cc represents the actual movement of the j aws, which, for such short distances as the thickness of the leather, is obviously perpendicular to the line b b and coincides with the radial line a a.

Fig. 4 is an illustrative diagram showing the curve of the jaws at c c drawn from center b The line b 1) corresponds with the line b b in Fig. 2, the line a a with the line aa at right angles to b b in Fig. 2.

g is the center pivot; c 0 lines drawn concentric therewith, like c c in Fig. 2. a a is the radial line; d e, the upper and lowerjaws, and h the hammer. By the change made in the jaws in my invention the lines a a and a. a are made to coincide and agree together in the line a a in Fig. 2.

To secure avariable fulcrum for the jaws, I pivot a loose flap, f, in front of the hammer h, 1" being the rivet or hinge, and s a spring fitted to the hammer or jaw e, and operating to keep the flap in the desired position. A flat end and a corner, 8, are formed on the flap near the hinge to bear on the spring 8, which thus holds the flap in the position shown in Fig. 2 close beneath the aw 6 when not in use. When required for use, the flap may be pulled down in front of the hammer, as indicated by the dotted line f, or may be used in any desired point of the curved line at tin Fig. 2.

Pinchers with curvedjaws have proved best suited for lasting boot and shoe uppers. owing to the peculiar position of the upper in relation to the last at the time the operation is performed. The nearer the shape of the jaws conforms to the position of the upper at such time the less is the liability to injure the up-v descend obliquely upon the lower and chafe and cut the leather in the manner described.

By my improvements the lasting-pinchers may be formed with curved jaws of the shape desired, and a perpendicular movement of the teeth secured by the proper location of the pivot g, the handles being independently adjusted to any desired angle or position relative to the jaws or the hammer.

I am aware of United States Patents Nos. 65,117 and 236,430, and that neither a movable fulcrum or curved jaws are new in themselves; but my movable fulcrum differs from others in being combined with the hammer h in such manner that the hammer is arranged to support the fulcrum when desired, as indicated at the dotted lines f'in Fig. 2. I therefore disclaim the patents referred to and any construction different from my own, which I claim as follows:

1. The combination, in lasting-pinchers, of the opposingjaws provided with the concave and convex teeth d and e.

2. In lasting-pinchers, the combination, with the lower jaw, i, of the upper jaw provided with lip Z, arranged'and operated as set forth.

3. The combination, in lasting-pinchers, of the opposing jaws provided with the concave and convex teeth (2 and e, the lower jaw being constructed with convex tip to prevent the cutting action of rectangular corners, substantially as shown and described.

4. Lasting-pinchers constructed with the handles i j, the hammer h, and the opposing jaws provided with the concave and convex teeth d and e, the jaws being curved at their outer ends, substantially as described, tangentially to a radial line drawn from the pivot g to the junction of thejaws near the tip of the same, the whole arranged and operated substantially as and for the purpose set forth.

5. The combination, with the lower jaw, e, and the hammer h, of the movable fulcrum f, pivoted at r, and provided with the spring 8, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

KASPER J. GREENWALD.

\Vit-nesses:

J OHN A. RODRIGO, THOS. S. CRANE. 

